13
Direct Vent - Vent Installation - Through the Roof
1. Vent and Combustion Air Penetration
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Vent pipe penetration through combustible or
non-combustible wall material should maintain a
minimum 1/4” [6 mm] clearance for 3” and 4”
PVC/CPVC vent or 1” [2.5cm] for 2” PVC/CPVC
vents. The diameter of the penetration hole
should be 4” [10.2 cm] minimum for 2” and 3”
pipe or 5” [12.7 cm] minimum for 4” pipe. When
using Polypropylene or Stainless Steel Vent
refer to vent manufacture’s installation instruc-
tions, supplied with the vent for clearances.
-
Combustion air pipe penetration can maintain
zero clearance. The diameter of the penetration
hole should be 2-3/8” [6 cm] minimum for 2” pipe
or 3-1/2” [8.9 cm] minimum for 3” pipe or 4-1/2”
[11.4 cm] minimum for 4” pipe.
2. The installer must use a galvanized metal thimble for
the vent pipe penetration.
3. Locate the vent and combustion air pipe penetra-
tions to provide clearances as described in Fig. 1 &
Fig. 2 on page 12.
4. The installer must comply with all local codes for iso-
lating the vent and combustion air pipes as they
pass through floors, ceilings and roofs.
5. The installer should provide adequate flashing and
sealing boots sized for the vent pipe and combustion
air pipe.
Termination Fittings - Through the Roof
1. The vent and combustion air terminations must include
a factory supplied “bird screen” installed as shown in
Figs. 4, 5 & 6 on page 14.
2. The combustion air piping must terminate in an
upside down “U” shape fashion using two 90
º
elbows as shown in Fig. 1 page 12 or with a tee as
shown in Fig. 2 on page 12.
3. The vent piping must terminate vertically with a cou-
pling as shown in Figs. 1 & 2 page 12.
Do not extend the vent pipe above the roof beyond
the dimensions shown in Fig. 1 & Fig. 2 on page 12
Extended exposure of the vent pipe could cause
condensate to freeze and block the vent pipe.
WARNING
6. The vent termination must also maintain the follow-
ing clearances; as shown in Fig.3.
a. At least 3 feet [0.9 m] from adjacent walls
b. At least 3 feet [0.9 m] below roof over hangs
c. At least 7 feet [2.1 m] above any public walk-
ways
d. At least 3 feet [0.9 m] above any forced air
intake within 10 feet [3 m] (does not apply to the
combustion air inlet of a direct vent appliance).
e. No closer than 12” [30.5 cm] below or horizon-
tally from any door or window or gravity air inlet.
f. Must be at least 4 feet [1.2 m] from any electric
meters, gas meters-regulators, relief valves or
other equipment. Never terminate the vent
above or below any of these items within 4 feet
[1.2 m] horizontally.
g. A minimum 12 inches [30.5 cm] horizontal spacing
from other fan assisted appliance vents such as
clothes dryer vent, kitchen exhaust vent etc. Never
terminate the vent above or below any fan assist-
ed vent within 12 inches [30.5 cm] horizontally.
7. Locate the vent and combustion air terminations in a
manner to protect from damage by foreign objects,
such as stones, balls, or buildup of leaves or sediment.
8. Do not connect any other appliance to the vent pipe
or multiple boilers to a common vent pipe.
Direct Vent Installation of Vent/Air Piping
Termination Clearances of Direct Vent
System
Fig. 3:
Содержание Prestige CPVC
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